Full aluminum construction Uses a 3 position timer with a delay of 1-5 seconds Reliable and low maintenance Timer detonates on almost any surface Variable sound output depending on which cartridge used( Brown for CQB clearing, Green for loud indoor use, Yellow for extremely loud outdoor use) Easy to reload (Cartridges can be found at most hardware stores) Fits in a standard M4 pouchManufacturer Airsoft InnovationMaterial Aluminum alloyPower 0.22 Powder nail driver cartridges (Not Blanks)Height 5 inchesDiameter 2 inchesWeight 18 ozIn the Box 1x Grenade 1x Manual 2x Pull pins